WO2003079916A1 - Method and system for treating skin with rf - Google Patents

Method and system for treating skin with rf Download PDF

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Publication number
WO2003079916A1
WO2003079916A1 PCT/IL2003/000217 IL0300217W WO03079916A1 WO 2003079916 A1 WO2003079916 A1 WO 2003079916A1 IL 0300217 W IL0300217 W IL 0300217W WO 03079916 A1 WO03079916 A1 WO 03079916A1
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WO
WIPO (PCT)
Prior art keywords
skin
energy
region
negative pressure
applicator
Prior art date
Application number
PCT/IL2003/000217
Other languages
French (fr)
Inventor
Michael Kreindel
Amir Waldman
Original Assignee
Syneron Medical Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Syneron Medical Ltd. filed Critical Syneron Medical Ltd.
Priority to EP03708466A priority Critical patent/EP1489984A1/en
Priority to JP2003577751A priority patent/JP4452511B2/en
Priority to AU2003212641A priority patent/AU2003212641A1/en
Publication of WO2003079916A1 publication Critical patent/WO2003079916A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/1402—Probes for open surgery
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053—Mechanical features of the instrument of device
    • A61B2018/00273—Anchoring means for temporary attachment of a device to tissue
    • A61B2018/00291—Anchoring means for temporary attachment of a device to tissue using suction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
    • A61B2018/00452—Skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/053—Measuring electrical impedance or conductance of a portion of the body
    • A61B5/0531—Measuring skin impedance
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/08—Cupping glasses, i.e. for enhancing blood circulation

Definitions

  • the invention relates to methods and devices for treating skin.
  • Skin tissue consists of an outer epidermal layer overlying a dermal layer that is in contact with a layer of subcutaneous adipose tissue.
  • Massaging of the skin has long been known to improve the blood circulation in the subcutaneous adipose tissue.
  • Various types of massaging devices have been used for treating adipose tissue.
  • US Patent No. 5,961,475 discloses a massaging device in which negative pressure is applied to the skin together with massaging. The combined treatment increases the blood circulation in the subcutaneous adipose tissue and breaks connections between adipose cells in the tissue.
  • the present invention is based upon the finding that skin heating improves skin elasticity and oxygen dissociation from hemoglobin in the blood. Improved skin elasticity allows more aggressive massaging of the skin, and oxygen dissociation from hemoglobin causes fat destruction. In order to obtain these beneficial effects of heating on subcutaneous adipose tissue, it is necessary to conduct heat applied to the skin surface into the skin tissue to a depth of about 1cm without damaging the skin.
  • the present invention is also based upon the findings that deforming a region of skin so that the region protrudes out from surrounding skin enhances heat delivery to the subcutaneous adipose tissue and cartilage.
  • a region of skin to be treated is deformed so that the region protrudes out from surrounding skin, and radio-frequency (RF) energy is applied to the protrusion by applying one or more RF electrodes to the skin surface.
  • RF radio-frequency
  • the region of skin is deformed by applying a negative pressure to the region of the skin. Applying negative pressure to skin also increases the blood circulation in the skin.
  • the skin surface can be hydrated to improve electrode coupling.
  • the RF electrodes may optionally be used to monitor skin impedance during the treatment. Since increasing skin temperature leads to a change in impedance, monitoring the skin impedance allows the temperature distribution in the skin to be followed so that the parameters of the treatment (intensity of the pressure or the RF energy) may be altered to optimize the treatment.
  • a method for carrying out a treatment of skin comprising, for each of one or more regions of the skin:
  • a system for treating skin comprising:
  • FIG. 1 shows a system for treatment of skin in accordance with the invention
  • Fig. 2 shows an applicator for applying negative pressure and RF energy to skin in accordance with the invention
  • Fig. 3 shows deformation of skin with the applicator of Fig. 2.
  • An applicator 701 is configured to be applied to a region the skin of an individual 703 in a region to be treated.
  • the applicator 701 is connected to a control unit 704 via a cable 702.
  • a pump 706 is used to evacuate air from an interior chamber 106 in the applicator via a tube 118 extending from the pump 706 along the cable 702 to the interior chamber 106.
  • the control unit 703 includes a power source 705.
  • the power source 705 is connected to a pair of RF electrodes 201 and 202 in the applicator 701 via wires 115 and 116 that pass through the tube 118 in the cable 702.
  • the control unit 701 has an input device such as a keypad 707 that allows an operator to input selected values of parameters of the treatment, such as the power of the RF energy or the intensity of the negative pressure.
  • the control unit 701 optionally contains a processor 708 for monitoring and controlling various functions of the device. For example, the processor 708 may monitor the RF current and voltage and calculate the skin temperature during the treatment.
  • the applicator 701 includes a bell-shaped housing 105 enclosing the interior space 106
  • the interior space 106 is open on the bottom so that when applied to a region 108 of skin, the skin is in contact with the interior space 106.
  • the area of skin in contact with the interior chamber 106 is preferably between 1 to 50 cm .
  • the skin tissue includes an epidermal layer 130 and a dermal layer 132 overlaying a layer of subcutaneous adipose tissue 133.
  • a gasket 107 around the edge of the housing creates a seal with the region 108 of the skin surface when applied to the surface.
  • the RF electrodes 201 and 202 are embedded in the housing 105 and are configured to apply RF energy to the region of skin to be treated.
  • the tube 118 is dimensions to fit snugly on a nipple 203 located on the top of the housing 105.
  • the wires 115 and 116 are attached to terminals 120 and 121, respectively.
  • the terminals 120 and 121 are in electrical contact with the electrodes 201 and 202, respectively, via wires 125 and 126, respectively, in the housing 105.
  • Thermo-electric coolers 140 and 141 cool the electrodes 201 and 202 in order to prevent burning of the skin.
  • Activating the pump 706 partially evacuates the interior 106 of the applicator, so as to create a negative pressure in the interior of the applicator 701.
  • Fig. 3 shows the applicator and the region of skin after partial evacuation of the interior 106 of the applicator.
  • the region 108 of the skin in contact with the interior of the applicator has been deformed so as to protrude into the interior of the applicator.
  • the subcutaneous adipose tissue 133 is brought closer to the RF electrodes 201 and 202.
  • RF energy is then applied to the skin by the electrodes.
  • a skin massager (not shown) may also be associated with the applicator for massaging the skin during the RF treatment.
  • ⁇ RF frequency 0.3-10MHz.
  • ⁇ Average output power from about 1 to about 300 W.
  • ⁇ Pressure in the interior chamber 106 from 0.2 to 1 atmosphere.

Abstract

A method and system for treating skin. The method comprises deforming the skin so that a region of skin protrudes from surrounding skin, and applying radio frequency (RF) energy to the skin. The system comprises a skin deformer that deforms a region of skin so that a region of skin protrudes out from surrounding skin. The system also comprises one or more RF electrodes configured to apply RF energy to the skin. The invention may be used to treat subcutaneous adipose tissue and cartilage.

Description

METHOD AND SYSTEM FOR TREATTING SKIN WITH RF
FIELD OF THE INVENTION
The invention relates to methods and devices for treating skin.
BACKGROUND OF THE INVENTION
Skin tissue consists of an outer epidermal layer overlying a dermal layer that is in contact with a layer of subcutaneous adipose tissue. Massaging of the skin has long been known to improve the blood circulation in the subcutaneous adipose tissue. Various types of massaging devices have been used for treating adipose tissue. US Patent No. 5,961,475 discloses a massaging device in which negative pressure is applied to the skin together with massaging. The combined treatment increases the blood circulation in the subcutaneous adipose tissue and breaks connections between adipose cells in the tissue.
US Patent No. 6,273,884 to Altshuler et al. discloses simultaneous application of optical energy and negative pressure to the skin in order to treat a skin defect.
SUMMARY OF THE INVENTION
The present invention is based upon the finding that skin heating improves skin elasticity and oxygen dissociation from hemoglobin in the blood. Improved skin elasticity allows more aggressive massaging of the skin, and oxygen dissociation from hemoglobin causes fat destruction. In order to obtain these beneficial effects of heating on subcutaneous adipose tissue, it is necessary to conduct heat applied to the skin surface into the skin tissue to a depth of about 1cm without damaging the skin. The present invention is also based upon the findings that deforming a region of skin so that the region protrudes out from surrounding skin enhances heat delivery to the subcutaneous adipose tissue and cartilage.
In accordance with the invention, a region of skin to be treated is deformed so that the region protrudes out from surrounding skin, and radio-frequency (RF) energy is applied to the protrusion by applying one or more RF electrodes to the skin surface. In a preferred embodiment, the region of skin is deformed by applying a negative pressure to the region of the skin. Applying negative pressure to skin also increases the blood circulation in the skin. The skin surface can be hydrated to improve electrode coupling.
The RF electrodes may optionally be used to monitor skin impedance during the treatment. Since increasing skin temperature leads to a change in impedance, monitoring the skin impedance allows the temperature distribution in the skin to be followed so that the parameters of the treatment (intensity of the pressure or the RF energy) may be altered to optimize the treatment.
Thus, in a first aspect of the invention there is provided a method for carrying out a treatment of skin, comprising, for each of one or more regions of the skin:
(a) deforming the skin so that the region of skin protrudes from surrounding skin;
(b) applying radio frequency (RF) energy to the skin.
In a further aspect of the invention there is provided a system for treating skin, comprising:
(a) a skin deformer deforming the skin so that a region of skin protrudes out from surrounding skin; and
(b) one or more RF electrodes configured to apply RF energy to the skin. BRIEF DESCRIPTION OF THE DRAWINGS
In order to understand the invention and to see how it may be carried out in practice, a preferred embodiment will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which: Fig. 1 shows a system for treatment of skin in accordance with the invention;
Fig. 2 shows an applicator for applying negative pressure and RF energy to skin in accordance with the invention; and
Fig. 3 shows deformation of skin with the applicator of Fig. 2.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to Figs. 1 and 2, a device for applying negative pressure and RF energy to skin in accordance with the invention is shown. An applicator 701, to be described in detail below, is configured to be applied to a region the skin of an individual 703 in a region to be treated. The applicator 701 is connected to a control unit 704 via a cable 702. A pump 706 is used to evacuate air from an interior chamber 106 in the applicator via a tube 118 extending from the pump 706 along the cable 702 to the interior chamber 106. The control unit 703 includes a power source 705. The power source 705 is connected to a pair of RF electrodes 201 and 202 in the applicator 701 via wires 115 and 116 that pass through the tube 118 in the cable 702. The control unit 701 has an input device such as a keypad 707 that allows an operator to input selected values of parameters of the treatment, such as the power of the RF energy or the intensity of the negative pressure. The control unit 701 optionally contains a processor 708 for monitoring and controlling various functions of the device. For example, the processor 708 may monitor the RF current and voltage and calculate the skin temperature during the treatment.
Referring still to Fig. 2, the applicator 701 includes a bell-shaped housing 105 enclosing the interior space 106 The interior space 106 is open on the bottom so that when applied to a region 108 of skin, the skin is in contact with the interior space 106. The area of skin in contact with the interior chamber 106 is preferably between 1 to 50 cm . The skin tissue includes an epidermal layer 130 and a dermal layer 132 overlaying a layer of subcutaneous adipose tissue 133. A gasket 107 around the edge of the housing creates a seal with the region 108 of the skin surface when applied to the surface. The RF electrodes 201 and 202 are embedded in the housing 105 and are configured to apply RF energy to the region of skin to be treated.
Referring still to Fig. 2, the tube 118 is dimensions to fit snugly on a nipple 203 located on the top of the housing 105. The wires 115 and 116 are attached to terminals 120 and 121, respectively. The terminals 120 and 121 are in electrical contact with the electrodes 201 and 202, respectively, via wires 125 and 126, respectively, in the housing 105. Thermo-electric coolers 140 and 141 cool the electrodes 201 and 202 in order to prevent burning of the skin.
Activating the pump 706 partially evacuates the interior 106 of the applicator, so as to create a negative pressure in the interior of the applicator 701. Fig. 3 shows the applicator and the region of skin after partial evacuation of the interior 106 of the applicator. The region 108 of the skin in contact with the interior of the applicator has been deformed so as to protrude into the interior of the applicator. In this configuration of the skin, the subcutaneous adipose tissue 133 is brought closer to the RF electrodes 201 and 202. RF energy is then applied to the skin by the electrodes. A skin massager (not shown) may also be associated with the applicator for massaging the skin during the RF treatment.
Using the system of the invention to treat a region of skin having an area of about 10 cm , the following exemplary parameter values may be used:
■ RF frequency: 0.3-10MHz. ■ Average output power: from about 1 to about 300 W.
■ Pressure in the interior chamber 106: from 0.2 to 1 atmosphere.

Claims

CLAIMS:
1. A method for carrying out a treatment of skin, comprising, for each of one or more regions of the skin:
(a) deforming the skin so that the region of skin protrudes from surrounding 5 skin;
(b) applying radio frequency (RF) energy to the skin.
2. The method according to Claim 1 further comprising messaging the skin.
3. The method according to Claim 1 further comprising cooling the skin.
4. The method according to Claim 1 wherein deforming the skin comprises 10 applying a negative pressure to the skin.
5. The method according to Claim 1 wherein the treatment involves treating subcutaneous adipose tissue or cartilage.
6. The method according to Claim 1 wherein the frequency of the RF energy
Figure imgf000006_0001
15 7. The method according to Claim 1 wherein the power of the RF energy is
Figure imgf000006_0002
8. The method according to Claim 4 wherein the negative pressure is from 0.2 to 1 atmosphere.
9. A system for treating skin, comprising:
20 (a) a skin deformer deforming the skin so that a region of skin protrudes out from surrounding skin; and (b) one or more RF electrodes configured to apply RF energy to the skin.
10. The system according to Claim 9 wherein the skin is deformed by applying a negative pressure to the skin.
25 11. The system according to Claim 10 wherein the skin deformer comprises: (a) an applicator configured to be applied to the skin having a housing incompletely enclosing a space such that when applied to the skin the space is completely enclosed; (b) a pump removing air from the space when the applicator is applied to the skin.
12. The system according to Claim 9 further comprising a massager for massaging the skin.
13. The system according to Claim 9 further comprising a cooler for cooling the skin.
14. The system according to Claim 9 further comprising an impedance meter for measuring an impedance across one or more RF electrode pairs.
15. The system according to Claim 9 further comprising a processor configured to determine a heat distribution in the skin based upon one or more impedance measurements.
16. The system according to Claim 9 wherein the processor is further configured to determine one or more parameters of the RF energy based upon on or more impedance measurements.
17. The system according to Claim 16 wherein the one or more parameters are selected from the group comprising a pulse duration of the RF energy, a frequency of the RF energy, a power of the RF energy, and a delay time between cooling the skin an application of the RF energy.
18. The system according to Claim 9 wherein the frequency of the RF energy is from 0.3 to 10 MHz.
19. The system according to Claim 9 wherein the power of the RF energy is from 1 to 300 W.
20. The system according to Claim 10 wherein the negative pressure is from 0.2 to 1 atmosphere.
PCT/IL2003/000217 2002-03-26 2003-03-13 Method and system for treating skin with rf WO2003079916A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP03708466A EP1489984A1 (en) 2002-03-26 2003-03-13 Method and system for treating skin with rf
JP2003577751A JP4452511B2 (en) 2002-03-26 2003-03-13 Method and apparatus for treating skin with high frequency energy
AU2003212641A AU2003212641A1 (en) 2002-03-26 2003-03-13 Method and system for treating skin with rf

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/105,885 US6662054B2 (en) 2002-03-26 2002-03-26 Method and system for treating skin
US10/105,885 2002-03-26

Publications (1)

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WO2003079916A1 true WO2003079916A1 (en) 2003-10-02

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EP (2) EP1489984A1 (en)
JP (1) JP4452511B2 (en)
CN (1) CN100400009C (en)
AU (1) AU2003212641A1 (en)
WO (1) WO2003079916A1 (en)

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CN100400009C (en) 2008-07-09
EP1489984A1 (en) 2004-12-29
US20030187488A1 (en) 2003-10-02
US6662054B2 (en) 2003-12-09
EP2286751A1 (en) 2011-02-23

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